[Dwarf-discuss] Seeking a test program with a >4GB .debug_info section

[David Blaikie]

Oh, and I guess you could always make something even more artificial by
hand - if you compile some random code with -g to assembly, you could then
just pad out a .debug_info contribution with lots of zeros (there are some
assembly directives for that, I think, but don't know assembly that well
off hand) - would make it arbitrarily large without the need to tax the
compiler creating novel/real DWARF, etc.

On Thu, Apr 20, 2023 at 6:54 PM David Blaikie <dblaikie@gmail.com> wrote:

> I /believe/ that Chromium (maybe specifically on ARM? not sure) may have
> hit/had problems with the 4GB limit - probably trivially if you build with
> clang but pass `-fstandalone-debug` which disables many type
> reduction/deduplication strategies.
>
> If you want something more standalone... this:
>
>
> #define MEMBERS(BASE) \
>   int BASE##0 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##1 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##2 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##3 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##4 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##5 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##6 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##7 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##8 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int); \
>   int BASE##9 (int, int, int, int, int, int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, int);
> template<int ... i>
> struct t1 {
>   MEMBERS(f0)
>   MEMBERS(f1)
>   MEMBERS(f2)
>   MEMBERS(f3)
>   MEMBERS(f4)
>   MEMBERS(f5)
>   MEMBERS(f6)
>   MEMBERS(f7)
>   MEMBERS(f8)
>   MEMBERS(f9)
> };
> #define ITER(A, B)    \
>   template <int... i> \
>   struct A {         \
>     B<i..., 0> v0;   \
>     B<i..., 1> v1;   \
>     B<i..., 2> v2;   \
>     B<i..., 3> v3;   \
>     B<i..., 4> v4;   \
>     B<i..., 5> v5;   \
>     B<i..., 6> v6;   \
>     B<i..., 7> v7;   \
>     B<i..., 8> v8;   \
>     B<i..., 9> v9;   \
>   };
> ITER(t2, t1);
> ITER(t3, t2);
> ITER(t4, t3);
> ITER(t5, t4);
> ITER(t6, t5);
> ITER(t7, t6);
> ITER(top, t7);
> int main() {
>   t6<> v;
> }
>
> Doesn't quite hit 4GB, it's about 1.2GB in .debug_info (& takes 2.5
> minutes to compile with clang) - 5 of these (could stamp them out by
> including this file into a few other source files & just changing the
> `main` function to some other name in each)
>
> This specifically doesn't push the .debug_str section as hard - it's about
> half the size of the .debug_info in this program.
>
>
>
> On Thu, Apr 20, 2023 at 7:08 AM John DelSignore via Dwarf-discuss <
> dwarf-discuss@lists.dwarfstd.org> wrote:
>
>> Is anyone aware of an open-source program or test program that when
>> compiled and built on Linux x86_64, results in a .debug_info section that
>> is greater than 4GB? I'm looking for a test program (realistic or not) that
>> contains 32-bit DWARF CUs in a .debug_info section that is about 5GB long,
>> or longer.
>>
>> Thanks, John D.
>>
>>
>>
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